Commit 8323fa6b authored Jun 17, 2011 by Alex Deucher Committed by Dave Airlie Jun 20, 2011

drm/radeon/kms/atom: fix duallink on some early DCE3.2 cards



Certain revisions of the vbios on DCE3.2 cards have a bug
in the transmitter control table which prevents duallink from
being enabled properly on some cards.  The action switch statement
jumps to the wrong offset for the OUTPUT_ENABLE action.  The fix
is to use the ENABLE action rather than the OUTPUT_ENABLE action
on the affected cards.  In fixed version of the vbios, both
actions jump to the same offset, so the change should be safe.

Reported-and-tested-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

parent de505e70

drivers/gpu/drm/radeon/radeon_encoders.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -1431,6 +1431,10 @@ radeon_atom_encoder_dpms(struct drm_encoder *encoder, int mode)
		if (is_dig) {
		switch (mode) {
		case DRM_MODE_DPMS_ON:
		/* some early dce3.2 boards have a bug in their transmitter control table */
		if ((rdev->family == CHIP_RV710) \|\| (rdev->family == CHIP_RV730))
		atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE, 0, 0);
		else
		atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE_OUTPUT, 0, 0);
		if (atombios_get_encoder_mode(encoder) == ATOM_ENCODER_MODE_DP) {
		struct drm_connector *connector = radeon_get_connector_for_encoder(encoder);